CN109997249A - The battery unit of electrolyte, battery pack can be reinjected, reinject system and electrolyte for battery pack reinjects method for the electrolyte of battery pack - Google Patents

The battery unit of electrolyte, battery pack can be reinjected, reinject system and electrolyte for battery pack reinjects method for the electrolyte of battery pack Download PDF

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Publication number
CN109997249A
CN109997249A CN201880004552.6A CN201880004552A CN109997249A CN 109997249 A CN109997249 A CN 109997249A CN 201880004552 A CN201880004552 A CN 201880004552A CN 109997249 A CN109997249 A CN 109997249A
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China
Prior art keywords
electrolyte
unit
solvent
battery
battery pack
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Granted
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CN201880004552.6A
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CN109997249B (en
Inventor
洪哲基
李在宪
金东规
金大洙
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LG Energy Solution Ltd
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LG Chemical Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/691—Arrangements or processes for draining liquids from casings; Cleaning battery or cell casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/121—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/673—Containers for storing liquids; Delivery conduits therefor
    • H01M50/682—Containers for storing liquids; Delivery conduits therefor accommodated in battery or cell casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Filling, Topping-Up Batteries (AREA)

Abstract

The electrolyte that a kind of electrolyte of battery pack the present invention relates to battery unit that can reinject electrolyte, for including multiple battery units reinjects system and the battery pack for electric vehicle reinjects method.

Description

Can reinject the battery unit of electrolyte, battery pack, for battery pack electrolyte again Injected system and electrolyte for battery pack reinject method
Technical field
The present invention relates to a kind of battery units that can reinject electrolyte, the battery pack for being made of multiple battery units Electrolyte reinject system, reinject method for the electrolyte of the battery pack of electric vehicle.
Background technique
In general, secondary cell refer to it is different from non-rechargeable one-shot battery can charge/discharge battery, secondary cell It is widely used in the electronic equipment or electric vehicle of such as mobile phone, laptop computer, field camera etc.Especially It is, 3 times of capacity of capacity of operating voltage, about nickel-cadmium cell or nickel-metal hydride battery due to lithium secondary battery with about 3.6V, And the energy density of higher per unit weight, so the usage degree of lithium secondary battery increases explosively.
This lithium secondary battery mainly uses lithium type oxide and carbon material living respectively as positive electrode active materials and cathode Property material.Lithium secondary battery includes: the electrode assembly of the aggregate as unit cells, and each unit cells, which have, wherein to exist The structure of positive plate and negative plate is set in the case where being plugged with diaphragm between positive plate and negative plate, in positive plate and negative plate It is upper to be applied with positive electrode active materials and negative electrode active material respectively；For sealing and the shell of accommodate electrod component；Be used to soak The electrolyte of stain electrode assembly.
According to the shape of shell, lithium secondary battery is divided into can type secondary battery and bag type secondary battery, in the secondary electricity of pot Chi Zhong, electrode assembly are incorporated into metal can, and in bag type secondary battery, electrode assembly is incorporated into the bag of metal layer tabletting In shell.
Bag type secondary battery has the advantages that manufacturing cost is low, energy density is high, and the advantage is that and connected by it It connects or is connected in parallel and be readily configured large-capacity battery pack, therefore, bag type secondary battery is dynamic recently as electric vehicle or mixing The power supply of power vehicle and attract attention.
It so manufactures bag type secondary battery: the electrode assembly connecting with plate electrode lead is contained in bag shell, it will Electrolyte is injected into bag shell, and the edge of bag shell is hot-melted.A part of contact conductor is exposed to bag shell Outside, and the contact conductor exposed is electrically connected to the equipment for installing secondary cell thereon, or the contact conductor exposed For secondary cell to be electrically connected to each other.
In the secondary battery, according to duplicate charge/discharge cycle, the degeneration of electrolyte occurs.Therefore, it can help to electricity The amount of the electrolyte of chemical reaction is reduced at any time, so that the charge/discharge efficiency of secondary cell and capacity retention ratio decline, are answered When replacement or secondary cell is abandoned, but causes economic loss to increase due to excessively high cost, as the solution to this limitation Scheme has energetically carried out the research to recycling (reuse).
Traditional reuse method includes removing gas by disassembly secondary cell to reduce the resistance of secondary cell Method.However, due to a large amount of cost and technical problem, dismantling secondary cell simultaneously under anhydrous (moisture free) environment It is difficult to as reuse method using the existing method of vacuum suction (vacuum suction) removal gas come practical application.
In addition, replacing lithium source despite the presence of the electrolyte of injection predetermined amount and adjusting electrolyte with its suitable recycled His method, but most of existing methods be wherein should under controllable environment by using expensive equipment in the secondary battery Electrolyte is injected, and injects the side of electrolyte by forming hole or cutter unit terrace part in the shell of secondary cell Method, consequently it is difficult to be applied as actual reuse method.
Summary of the invention
Technical problem
The present invention is designed to solve above-mentioned limitation, the object of the present invention is to provide one kind for electrolyte to be re-introduced into electricity System and method in pool unit and battery pack, wherein can remove side reaction gas (gas) and electrolyte can be reinjected and nothing Need detachable battery unit.
It is a further object to provide a kind of for electrolyte to be re-introduced into battery unit and battery pack System and method, wherein it is practical to constitute sealing characteristics of the battery unit of battery pack etc. even if performing reinjecting for electrolyte On will not still decline.
It will be described below and will understand other objects and advantages of the present invention by illustrative embodiments.In addition, Objects and advantages of the present invention can be realized by the combination of feature described in claim and feature.
Technical solution
According to an illustrative embodiment of the invention, a kind of battery unit reinjecting electrolyte, comprising: electrode group Part, the electrode assembly include negative plate, positive plate and the diaphragm being plugged between the negative plate and the positive plate；And list Member accommodates shell, and the unit accommodates shell for accommodating electrolyte and the electrode assembly, wherein the unit accommodates shell There is the unit injection port including injection valve on one side thereof, and on its other side in face of the unit injection port With the unit discharge port including dump valve.
Another exemplary embodiment according to the present invention, a kind of battery pack reinjecting electrolyte, comprising: one or Multiple battery units；Main injection pipe, the main injection pipe are used to solvent or electrolyte being supplied to each battery unit；Main discharge Pipe, the main discharge are used to that the solvent or the electrolyte to be discharged from each battery unit；And shell, in which: the electricity Pool unit includes that electrode assembly and the unit for accommodating the electrode assembly and the electrolyte accommodate shell, the electrode group Part includes negative plate, positive plate and the diaphragm being plugged between the negative plate and the positive plate；The unit accommodates shell There is the unit injection port including injection valve on one side thereof, and on its other side in face of the unit injection port With the unit discharge port including dump valve；The main injection pipe is in parallel by the unit injection port of the battery unit Connection, and the solvent and the electrolyte is allowed to be supplied to each battery unit；The main discharge is by the battery list The unit discharge port of member is connected in parallel, and the electrolyte of the cell internal is allowed to be discharged to the outside； And the shell accommodates one or more of battery units, the main injection pipe and the main discharge, and described outer Shell has side and the other side, and the main injection port of the main injection pipe is exposed to outside, the main discharge from the side Main discharge port be exposed to outside from the other side.
Another illustrative embodiments according to the present invention, a kind of electrolyte for battery pack reinject system, comprising: Multiple battery units, each battery unit include that unit accommodates shell, and the unit accommodates shell and is configured to accommodate electrod component, The electrode assembly includes negative plate, positive plate and the diaphragm being plugged between negative plate and positive plate, wherein the unit holds Shell of receiving has the unit injection port including injection valve on one side thereof, and at it in face of the another of the unit injection port There is the unit discharge port including dump valve on side；Battery pack, in the battery pack, the list of each battery unit First injection port is connected in parallel with each other by main injection pipe, and the unit discharge port of each battery unit passes through main discharge It is connected in parallel with each other, the unit injection port and the unit discharge port are received in the shell, and the main injection The main injection port of pipe and the main discharge port of the main discharge pass through the shell and are exposed to outside；Liquid injection Pump, the liquid infusion pump are connected to the main injection port of the main injection pipe of the battery pack；Solvent tank, it is described molten Agent tank includes solvent valve, and the solvent valve is configured for answering or prevent to be supplied to the solvent of the liquid infusion pump；Electrolyte tank, The electrolyte tank includes electrolyte valve, and the electrolyte valve is configured for answering or prevent to be supplied to the electricity of the liquid infusion pump Xie Zhi；Electrolyte reinjects determination unit, and the electrolyte reinjects determination unit and is configured to calculate the 1C appearance of the battery pack Amount conservation rate (%) simultaneously determines the necessity for reinjecting electrolyte；Supply computing unit, the supply computing unit configuration At the amount for calculating the solvent and the electrolyte that be supplied to the solvent tank and the electrolyte tank；Control unit, institute Control unit is stated to be configured to reinject the necessity for reinjecting electrolyte that determination unit determines, control according to from the electrolyte The injection valve, the dump valve, the liquid infusion pump, the solvent valve and the electrolyte valve, thus by calculated The amount of solvent and electrolyte is supplied to each battery unit for constituting the battery pack；And notification unit, the notification unit are matched Be set to the necessity for notifying user to reinject electrolyte and calculated solvent and electrolyte amount.
The battery pack can further comprise the gas outlet pipe on the side of the main discharge, wherein the gas Discharge pipe can further comprise gas amount measurement device.
The gas amount measurement device can measure the amount for the gas being discharged by the main discharge and by the gas of the amount Body is sent to the supply computing unit.
The 1C capacity retention ratio (%) can be calculated by following equation 1.
(equation 1)
In equation 1, the initial 1C discharge capacity is the calculated discharge capacity when manufacturing the battery pack, described Current 1C discharge capacity is the discharge capacity of the battery pack in.
Solvent supply amount can be calculated as the electrolyte having been injected into the battery pack by the supply computing unit About the 100% to about 150% of amount.
The supply computing unit can measure the amount for being discharged to the gas of the main discharge, based on the gas measured Amount, calculate and have been injected into and the amount of electrolyte that byproduct of reaction is converted to due to the chemical reaction with the electrode assembly (A), and by using following equation 2 electrolyte supply is calculated.
(equation 2)
Amount of electrolyte (the ml)-A (ml) for electrolyte supply (ml)=have been injected into
When the electrolyte, which reinjects determination unit determination, reinjects electrolyte, the openable electricity of described control unit The injection valve and the dump valve of pool unit, so that the solvent of the solvent tank is supplied to infuse by the liquid infusion pump Enter into each battery unit and be thus discharged the electrolyte of the cell internal；When the solvent is infused completely Fashionable, described control unit can close the dump valve of the battery unit and the solvent valve of the solvent tank and can The electrolyte valve of the electrolyte tank is opened, so that the electrolyte of the electrolyte tank is supplied to pass through the liquid Injection pump is injected into each battery unit and the solvent is thus discharged；And when the electrolyte is completely implanted, Described control unit can close the injection valve of the battery unit and the electrolyte valve of the electrolyte tank.
The notification unit can further comprise visual display unit, and the visual display unit is configured to display and reinjects The supply of the necessity of electrolyte and the solvent and the electrolyte.
Another exemplary embodiment according to the present invention, a kind of replacement are used for the electrolyte in the battery pack of electric vehicle Method, comprising: calculate use in battery pack 1C capacity retention ratio (%) 1C capacity retention ratio calculate step；Electrolyte It reinjects necessity and determines step, wherein when calculating calculated 1C capacity retention ratio in step in the 1C capacity retention ratio When (%) is calculated as predetermined percentage (%) below, the necessity for reinjecting electrolyte is determined；Electrolyte reinjects necessity Notifying process, wherein notifying the necessity for reinjecting electrolyte to user；Solvent supply amount shows step, wherein aobvious to user Show the amount of the solvent of solvent tank to be supplied to；Step is discharged, wherein the solvent for being supplied to the solvent tank is injected into structure At in each battery unit of the battery pack, and the electrolyte of each cell internal and reaction gas be discharged to outer Portion；Electrolyte supply shows step, wherein showing the amount of the electrolyte of electrolyte tank to be supplied to user；It is infused with electrolyte Enter step, wherein the electrolyte for being supplied to the electrolyte tank is injected into each battery unit for constituting the battery pack In.
1C capacity retention ratio (%) can be calculated by following equation 1.
In equation 1, the initial 1C discharge capacity is the calculated discharge capacity when manufacturing the battery pack, described Electric current 1C discharge capacity is the discharge capacity of the battery pack in.
Solvent supply amount can be calculated as about the 100% of the amount for the electrolyte having been injected into the battery pack to about 150%.
Electrolyte supply can be calculated by using following equation 2, to measure the outside for being discharged to the battery pack Gas amount, and the amount based on the gas measured, calculating have been injected into and due to the chemical reaction with electrode assembly and It is converted to the amount (A) of the electrolyte of byproduct of reaction.
(equation 2)
Amount of electrolyte (the ml)-A (ml) for electrolyte supply (ml)=have been injected into
Beneficial effect
According to an aspect of the present invention, there can be the electrolysis of the battery pack of reduced capacity retention ratio (%) by being discharged Matter and new electrolyte is reinjected in battery pack to extend the service life of battery pack.
According to another aspect of the present invention, required electrolyte is accurately determined in the case where not dismantling battery unit Amount and be discharged and in the reaction gas that cell internal generates become possible.
Detailed description of the invention
Fig. 1 is to illustrate cuing open for the section of the battery unit for reinjecting electrolyte of illustrative embodiments according to the present invention Face figure.
Fig. 2 schematically illustrates the section of the battery pack of illustrative embodiments according to the present invention.
The electrolyte for battery pack that Fig. 3 schematically illustrates illustrative embodiments according to the present invention, which reinjects, is System.
Fig. 4 is to illustrate the electrolyte for battery pack of illustrative embodiments according to the present invention to reinject the process of method Figure.
Fig. 5 is the figure for illustrating the variation of capacity retention ratio (%) of the battery pack of illustrative embodiments according to the present invention Table.
Specific embodiment
It should be appreciated that word used in the specification and claims or term should not be construed as limited by general sense and Dictionary meanings, but should be based on and the present invention on the basis of inventor can suitably define the principle of term for best interpretations The consistent meaning of technical aspect and design to explain.
Therefore, implementations described herein and the feature of attached drawing are only most preferred illustrative embodiments, are only used In illustration purpose, it is not intended to all technical concepts of the invention are represented, it is therefore to be understood that being that can make to it in the application Various modifications and equivalent.In addition, detailed description relevant to well-known technique etc. will be excluded, in order to avoid unnecessarily obscure of the invention Theme.
Fig. 1 is the sectional view for illustrating the battery unit for reinjecting electrolyte of illustrative embodiments according to the present invention.
Referring to Fig.1, battery unit 1 of the invention includes electrode assembly 10 and accommodate electrod component 10 and electrolyte 50 Unit accommodate shell 20, unit, which accommodates shell 20, can be configured to include unit injection port 30 and unit discharge port 40, singly First injection port 30 includes injection valve 31, and unit discharge port 40 includes dump valve 41.
Electrode assembly 10 is made of the aggregate of unit cells (not shown).Unit cells include: to be applied with anode thereon The positive plate (not shown) of active material, the negative plate (not shown) for being applied with negative electrode active material thereon and electric isolution are just The diaphragm (not shown) of pole plate and negative plate.Positive electrode active materials and negative electrode active material can be applied to coat anode and cathode Any one surface or two surfaces.Diaphragm for electrical isolation can be plugged between unit cells adjacent to each other.Unit electricity Pond can have the identical dual-battery structure of the polarity of wherein outmost electrode and the wherein polarity of outmost electrode phase each other Anti- full battery structure.
According to the stacking method of unit cells, electrode assembly can have various structures.That is electrode assembly can have letter Single stacked structure, stack/folding-typed structure, jelly volume structure etc..Simple stacked structure refers to stacks multiple unit electricity in order The structure in pond.In addition, stack/folding-typed structure refers to that such structure, plurality of unit cells are arranged with aturegularaintervals On band-like diaphragm, then wound along any one direction, so that unit cells are plugged between the diaphragm section being folded.This Outside, jelly volume structure is that the structure of unit cells is then wound on determining direction with band-like formation unit cells.
Electrode assembly 10 is provided with the electrode contact 11 and 12 extended from the electrode plate of unit cells.Electrode contact 11 and 12 With reciprocal polarity.Electrode contact 11 and 12 can have the knot extended from the positive plate or negative plate of component unit battery Structure.Alternatively, the structure that electrode contact 11 and 12 can have wherein sheet metal to be joined to positive plate or negative plate.Contact conductor is (not Show) electrode contact 11 and 12 is joined to by welding or electroconductive binder, it is thus electrically connected to electrode assembly.
Electrode assembly 10 unit is sealed in by electrolyte injection step and thermal fusion step to accommodate in shell.Unit holds Shell of receiving can have the structure that insulating polymer is wherein laminated in the upper and lower surfaces of metallic film.Metallic film prevents Outside moisture, gas etc. penetrate into electrode assembly side, improve unit and accommodate the mechanical strength of shell, and prevent from being injected into unit The chemical material accommodated in shell leaks into outside.It can be by using the alloy for being selected from iron, carbon, chromium and manganese；The conjunction of iron, chromium and nickel Gold；Aluminium；Or any one in its equivalent provides metallic film, but illustrative embodiments are without being limited thereto.When will include When the material of iron is used for metallic film, mechanical strength increases, and when using the material comprising aluminium, flexible reinforced.In general, having Aluminum metallic foil is used sharply.
Pouch-type unit is described in the present specification and accommodates shell, but illustrative embodiments are without being limited thereto, and can make With can accommodate electrod component, keep its shape and guard electrode component from external force any material.
Unit accommodates shell 20 and is provided with groove (not shown) corresponding with the shape of electrode assembly, so that electrode assembly can It is mounted on groove.If desired, groove can be omitted.
Unit accommodates shell 20 has unit injection port 30 on the side that it is provided with electrode contact 11 and 12, and There is unit discharge port 40 on its other side, electrolyte 50 is injected by unit injection port 30, from unit discharge port 40 discharge electrolyte.
In addition, unit injection port 30 and unit discharge port 40 respectively include injection valve 31 and dump valve 41, therefore, When closing injection valve 31 and dump valve 41, unit accommodates shell 20 and is sealed and can prevent electrolyte 50 from leaking into outside.
Therefore, in the battery unit 1 according to illustrative embodiments for reinjecting electrolyte, when according to injection valve 31 With opening/closing for dump valve 41, when injecting new electrolyte by unit injection port 30, it is discharged from unit discharge port 40 The electrolyte 50 of injection, therefore, the electrolyte of replaceable battery unit 1.
What Fig. 2 schematically illustrated illustrative embodiments according to the present invention includes multiple electricity for reinjecting electrolyte The section of the battery pack 100 of pool unit 1, Fig. 3 schematically illustrate illustrative embodiments according to the present invention for battery The electrolyte of group reinjects system.
Referring to Fig. 2 and Fig. 3, the battery pack 100 of illustrative embodiments includes: one or more battery list according to the present invention Member 1；Wherein accommodate the shell 110 of main injection pipe 120 and main discharge 130.
In addition, battery pack 100 may be arranged so that the unit injection port of each battery unit 1 is parallel-connected to main injection Pipe 120, and the unit discharge port 40 of each battery unit 1 is parallel-connected to main discharge 130.
Therefore, each battery unit can be supplied to by being supplied to the solvent of main injection pipe 120 or electrolyte, and from each electricity The solvent or electrolyte of pool unit discharge are discharged to main discharge 130.
In addition, the main injection port 121 of main injection pipe 120 and the main discharge port 131 of main discharge 130 are configured to pass through Shell 110 is simultaneously exposed to outside.
Main discharge 130 can be configured to further have gas outlet pipe 140 on one side thereof.
In addition, gas outlet pipe 140 is provided with gas phasor measurement unit 150, gas phasor measurement unit 150 is measured from main row The amount for the gas that outlet pipe 130 is discharged.
It includes: battery pack 100 that electrolyte according to illustrative embodiments for battery pack, which reinjects system,；Liquid note Enter pump 200；Solvent tank 300；Electrolyte tank 400；Electrolyte reinjects determination unit 510；Supply computing unit 530；Control Unit 520 is used to control the injection valve 31 and dump valve 41, liquid infusion pump 200,310 and of solvent valve of each battery unit Electrolyte valve 410；And notification unit 540, it the necessity for being used to that user to be notified to reinject electrolyte and should supply The amount of solvent and electrolyte.
In battery pack 100, main injection port 121 is connected to liquid infusion pump 200, and liquid infusion pump 200 gives main injection Pipe 120 supplies solvent tank 300 and solvent and electrolyte in electrolyte tank 400.
In addition, the main discharge 130 of battery pack 100 further has gas outlet pipe 140, and gas on one side thereof Discharge pipe 140 has the gas phasor measurement unit 150 being attached to thereon, allows the gas that will drain to main discharge 130 It is discharged to gas outlet pipe 140, and gas phasor measurement unit 150 measures the amount of gas and sends the measurements to supply Computing unit 530.
The operation of liquid infusion pump 200 is by controlling the control unit being described later on 520, and preferably, can be in pressure It is set in about 1.5kgf/cm2To about 2.2kgf/cm2In the range of while solvent and electrolyte be injected into main injection pipe In 120, solvent and electrolyte are injected into each battery unit 1 for constituting battery pack 100, but illustrative embodiments are unlimited In this.
Solvent tank 300 is configured to include solvent valve 310, and opening/closing for solvent valve 310 is controlled by control unit 520, and And solvent supply pipe 320 is connected to liquid infusion pump 200.
In addition, electrolyte tank 400 is configured to include electrolyte valve 410, opening/closing for electrolyte valve 410 is single by control Member 520 controls, and electrolyte supply pipe 420 is connected to liquid infusion pump 200.
It is configurable that the electrolyte being described below reinjects determination unit 510, supply computing unit 530 and control unit At including battery management system (BMS:Battery Management System) or being modular to be attached to battery pack 100 outside.
Battery management system (BMS:Battery Management System) controls the charge/discharge of battery pack 100, The status information for collecting such as state, temperature, charging current and discharge current etc, to manage battery pack 100.
Electrolyte reinjects the 1C capacity retention ratio (%) that determination unit 510 calculates battery pack 100, so that it is determined that battery pack The reflooded necessity of 100 electrolyte, 1C capacity retention ratio (%) can be calculated by equation 1.
(equation 1)
In equation 1, initial 1C discharge capacity is the discharge capacity when manufacturing battery pack 100, current 1C discharge capacity It is the 1C discharge capacity of the battery pack 100 in.
Discharge capacity is the unit for predicting or indicating the pot life of battery pack 100, and can be discharged by measurement The value of electric current simultaneously calculates the capacity of battery pack 100 to obtain.That is, 1C discharge capacity is indicated due to leading current discharge 1 hour The capacity of the battery pack 100 of cause.
Initial 1C discharge capacity can be calculated before manufacturing and using battery pack 100, and can be by using by cell tube The current value of reason system (BMS:Battery Management System) management calculates present discharge capacity.
It reinjects in determination unit 510 in electrolyte, is calculated when by the calculated 1C capacity retention ratio (%) of equation 1 When being about 70% to about 80%, it is preferable to determine the necessity that electrolyte is reinjected to battery pack 100, but the setting of range is not It is limited to this, can modifies if necessary when manufacturing battery.
When electrolyte reinjects determination unit 510, and the time for reinjecting electrolyte has been determined, supply computing unit 530 Calculate the amount of the solvent and electrolyte that be injected into battery pack 100.
In addition, the amount of the solvent and electrolyte calculated from supply computing unit 530 is sent to notification unit.
Based on the amount for the electrolyte having been injected into battery pack 100, the amount of solvent is calculated as the electrolyte having been injected into About the 100% to about 150% of amount.This is in order to by supplying the molten of sufficient amount to the battery unit 1 for constituting battery pack 100 Agent is discharged the whole electrolyte having been injected into.
While solvent is injected into each battery unit 1 for constituting battery pack 100, solvent is used for reaction gas It is discharged together with electrolyte and cleans the by-product that may be affixed to electrode assembly.
In addition, supply computing unit 530 passes through the gas that measures from the gas phasor measurement unit 150 of battery pack 100 Amount calculating have been injected into and the amount A of the electrolyte of by-product be converted to by the chemical reaction with electrode assembly 10, and Electrolyte supply is calculated by following equation 2.
(equation 2)
Amount of electrolyte (the ml)-A (ml) for electrolyte supply (ml)=have been injected into
Therefore, electrolyte can be supplied with amount needed for battery pack 100.
Have determined that control unit 520 opens battery unit when reinjecting electrolyte when electrolyte reinjects determination unit 510 1 injection valve 31 and dump valve 41 and the solvent valve 310 of solvent tank 300, to allow through liquid infusion pump 200 via main note Enter pipe 120 and be supplied to the solvent of solvent tank 300 to be injected into each battery unit 1, and allows the electricity inside battery unit 1 Solution matter is discharged.When solvent is fully injected into, control unit 520 close battery unit 1 dump valve 41 and solvent tank 300 it is molten Agent valve 310, and the electrolyte valve 410 of electrolyte tank 400 is opened, it allows through liquid infusion pump 200 via main injection The electrolyte that pipe 120 is supplied to electrolyte tank 400 is injected into each battery unit 1, and solvent is allowed to be discharged.This Outside, when electrolyte is completely implanted, control unit 520 closes the injection valve 31 of battery unit 1 and the electrolysis of electrolyte tank 400 Matter valve 410, to allow the air-tightness of battery unit 1 to be maintained.
Notification unit 540 has and will reinject necessity for reinjecting electrolyte that determination unit 510 determines from electrolyte It property and notifies from the amount of the calculated solvent of supply computing unit 530 and electrolyte to the function of user, and notification sheet Member 540 further comprises visual display unit, so that user can visually be provided notification to.
Fig. 4 is the flow chart that the diagram electrolyte according to illustrative embodiments for battery pack reinjects method, Fig. 5 It is the chart for illustrating the variation of 1C capacity retention ratio (%) of battery pack according to illustrative embodiments.
Referring to Fig. 4, the electrolyte according to illustrative embodiments for battery pack, which reinjects method and can be configured to, includes: 1C capacity retention ratio (%) calculates step (S100)；Electrolyte reinjects necessity and determines step (S200)；Electrolyte reinjects Necessity notifying process (S300)；Solvent supply amount shows step (S400)；It is discharged step (S500)；Electrolyte supply is shown Step (S600)；With electrolyte injection step (S700).
1C capacity retention ratio (%) is calculated step (S100) and can be executed by using following equation 1.
(equation 1)
In equation 1, initial 1C discharge capacity is the discharge capacity when manufacturing battery pack, current 1C discharge capacity be from BMS (Battery Management System) calculated value of battery pack in use.
It reinjects necessity in electrolyte to determine in step (S200), when 1C calculated in above step 100 holds When amount conservation rate is calculated as predetermined percentage (%) below, the necessity for reinjecting electrolyte is determined.It can be in design battery pack The step of in set the predetermined percentage (%), and can change and set the predetermined percentage according to the use of battery (%).
It is reinjected in necessity notifying process (S300) in electrolyte, when determining to battery pack in above step S200 When reinjecting the necessity of electrolyte, notify that user is electric by notification voice or by showing notice on visual display unit Solve the reflooded necessity of matter.
It shows in step (S400) in solvent supply amount, based on the amount for the electrolyte having been injected into battery pack, supplies molten The amount of agent is calculated as about the 100% to about 150% of the electrolyte having been injected into, and shows solvent supply amount to user.
In discharge step (S500), when the amount of calculated solvent in above step S400 of supply, liquid note Enter pump work and solvent is injected into the battery unit for constituting battery pack.
In this regard, due to the pressure of the solvent injected by liquid infusion pump, the electrolyte of cell internal is arranged Arrive outside out, and the reaction gas generated due to the chemical reaction of electrode assembly and the electrolyte of cell internal also by It is discharged to the outside.
Electrolyte supply show step (S600) in, from the solvent due to being injected in above step S500 and by The amount of reaction gas is measured among the electrolyte and reaction gas being discharged to the outside, and is calculated and had been injected into and be converted to electrolysis Therefore the amount A of the electrolyte of the byproduct of reaction of chemical reaction between matter and electrode assembly is shown to user by following The calculated electrolyte supply of equation 2.
(equation 2)
Amount of electrolyte (the ml)-A (ml) for electrolyte supply (ml)=have been injected into
In electrolyte supply step (S700), when supplying the calculated electrolyte in above step S600, liquid Body injects pump work and electrolyte is injected into the battery unit for constituting battery pack.
Fig. 5 is to illustrate according to an illustrative embodiment of the invention, the battery pack when reinjecting the electrolyte of battery pack The chart of the variation of 1C capacity retention ratio (%).
Referring to Fig. 5, it is to be understood that when the number of charge/discharge increases according to the use of battery pack, 1C capacity Conservation rate (%) gradually decreases, and the pot life of battery pack is reduced.
Further, it is to be appreciated that when reinjecting the electrolyte of battery pack, 1C capacity retention ratio (%) according to charging/ The decline width of the number of electric discharge reduces.Therefore, because electrolyte according to illustrative embodiments reinjects, battery pack Service life can be extended.
As described so far, by using the battery according to illustrative embodiments for reinjecting electrolyte Unit, battery pack reinject system and electrolyte for battery pack reinjects method for the electrolyte of battery pack, can be not Electrolyte is replaced in the case where the battery unit of disassembly composition battery pack；And can also by due to battery pack use and generate Reaction gas is discharged to the outside.

Claims (14)

1. the battery unit that one kind can reinject electrolyte, comprising:
Electrode assembly, the electrode assembly include negative plate, positive plate and are plugged between the negative plate and the positive plate Diaphragm；With
Unit accommodates shell, and the unit accommodates shell and is used to accommodate electrolyte and the electrode assembly,
Wherein the unit accommodates shell has the unit injection port including injection valve on one side thereof, and at it in face of institute Stating has the unit discharge port including dump valve on the other side of unit injection port.
2. the battery pack that one kind can reinject electrolyte, comprising:
One or more battery unit；
Main injection pipe, the main injection pipe are used to solvent or electrolyte being supplied to each battery unit；
Main discharge, the main discharge are used to that the solvent or the electrolyte to be discharged from each battery unit；With
Shell, wherein
The battery unit includes:
Electrode assembly, the electrode assembly include negative plate, positive plate and are plugged between the negative plate and the positive plate Diaphragm；And
Unit accommodates shell, and the unit accommodates shell for accommodating the electrode assembly and the electrolyte；
The unit accommodates shell has the unit injection port including injection valve on one side thereof, and at it in face of the list There is the unit discharge port including dump valve on the other side of first injection port；
The unit injection port of the battery unit is connected in parallel by the main injection pipe, and allows the solvent and institute It states electrolyte and is supplied to each battery unit；
The unit discharge port of the battery unit is connected in parallel by the main discharge, and allows the battery unit The internal electrolyte is discharged to the outside；And
The shell accommodates one or more of battery units, the main injection pipe and the main discharge, and described outer Shell has side and the other side, and the main injection port of the main injection pipe is exposed to outside, the main discharge from the side Main discharge port be exposed to outside from the other side.
3. a kind of electrolyte for battery pack reinjects system, comprising:
Multiple battery units, each battery unit include that unit accommodates shell, and the unit accommodates shell and is configured to accommodate electrod Component, the electrode assembly includes negative plate, positive plate and the diaphragm being plugged between negative plate and positive plate, wherein the list Member accommodates shell has the unit injection port including injection valve on one side thereof, and at it in face of the unit injection port The other side on have including dump valve unit discharge port；
Battery pack, in the battery pack, the unit injection port of each battery unit is connected in parallel to each other by main injection pipe Connection, the unit discharge port of each battery unit are connected in parallel with each other by main discharge, the unit injection port It is received in the shell with the unit discharge port, and the main injection port of the main injection pipe and the main discharge Main discharge port passes through the shell and is exposed to outside；
Liquid infusion pump, the liquid infusion pump are connected to the main injection port of the main injection pipe of the battery pack；
Solvent tank, the solvent tank include solvent valve, and the solvent valve is configured for answering or prevent to be supplied to the liquid to inject The solvent of pump；
Electrolyte tank, the electrolyte tank include electrolyte valve, and the electrolyte valve is configured for answering or prevent to be supplied to described The electrolyte of liquid infusion pump；
Electrolyte reinjects determination unit, and the electrolyte reinjects determination unit and is configured to calculate the 1C capacity of the battery pack Conservation rate (%) simultaneously determines the necessity for reinjecting electrolyte；
Supply computing unit, the supply computing unit, which is configured to calculate, will be supplied to the solvent tank and the electrolyte The solvent of tank and the amount of the electrolyte；
Control unit, described control unit be configured to according to from the electrolyte reinject determination unit determine reinject electrolysis The necessity of matter controls the injection valve, the dump valve, the liquid infusion pump, the solvent valve and the electrolyte valve, To which the amount of calculated solvent and electrolyte to be supplied to each battery unit for constituting the battery pack；With
Notification unit, the notification unit are configured to the calculated solvent of the necessity for notifying user to reinject electrolyte and institute With the amount of electrolyte.
4. electrolyte according to claim 3 reinjects system, wherein the battery pack further comprises in the main row Gas outlet pipe on the side of outlet pipe, wherein the gas outlet pipe further comprises gas amount measurement device.
5. electrolyte according to claim 4 reinjects system, wherein gas amount measurement device measurement is described in The amount of the gas of main discharge discharge simultaneously sends the supply computing unit for the gas of the amount.
6. electrolyte according to claim 3 reinjects system, wherein the 1C capacity retention ratio (%) pass through it is following Equation 1 calculates:
(equation 1)
In equation 1, the initial 1C discharge capacity is the calculated discharge capacity when manufacturing the battery pack, described current 1C discharge capacity is the discharge capacity of the battery pack in.
7. electrolyte according to claim 3 reinjects system, wherein the supply computing unit is by solvent supply amount It is calculated as about the 100% to about 150% of the amount for the electrolyte having been injected into the battery pack.
8. electrolyte according to claim 3 reinjects system, wherein the supply computing unit:
Measurement is discharged to the amount of the gas of the main discharge,
Based on the amount of the gas measured, calculating is had been injected into and is converted to due to the chemical reaction with the electrode assembly anti- The amount (A) of the electrolyte of by-product is answered, and
Electrolyte supply is calculated by using following equation 2
(equation 2)
Amount of electrolyte (the ml)-A (ml) for electrolyte supply (ml)=have been injected into.
9. electrolyte according to claim 3 reinjects system, in which:
Determine that described control unit opens the battery unit when reinjecting electrolyte when the electrolyte reinjects determination unit The injection valve and the dump valve so that the solvent of the solvent tank is supplied to be injected into often by the liquid infusion pump In a battery unit and thus the electrolyte of the cell internal is discharged；
When the solvent is completely implanted, described control unit closes the dump valve and the solvent of the battery unit The solvent valve of tank and the electrolyte valve for opening the electrolyte tank, so that being supplied to the described of the electrolyte tank Electrolyte is injected into each battery unit by the liquid infusion pump and the solvent is thus discharged；And
When the electrolyte is completely implanted, described control unit closes the injection valve and the electricity of the battery unit Solve the electrolyte valve of matter tank.
10. electrolyte according to claim 3 reinjects system, wherein the notification unit further comprises visual display Unit, the visual display unit are configured to the necessity and the solvent and the electrolyte that display reinjects electrolyte Supply.
11. reinjecting the method for electrolyte in a kind of battery pack for electric vehicle, comprising:
The 1C capacity retention ratio for calculating the 1C capacity retention ratio (%) of the battery pack in use calculates step；
Electrolyte reinjects necessity and determines step, wherein holding when calculating calculated 1C in step in the 1C capacity retention ratio When amount conservation rate (%) is calculated as predetermined percentage (%) below, the necessity for reinjecting electrolyte is determined；
Electrolyte reinjects necessity notifying process, wherein notifying the necessity for reinjecting electrolyte to user；
Solvent supply amount shows step, wherein showing the amount of the solvent of solvent tank to be supplied to user；
Step is discharged, wherein the solvent for being supplied to the solvent tank is injected into each battery list for constituting the battery pack In member, and the electrolyte of each cell internal and reaction gas are discharged to the outside；
Electrolyte supply shows step, wherein showing the amount of the electrolyte of electrolyte tank to be supplied to user；With
Electrolyte injection step, wherein the electrolyte for being supplied to the electrolyte tank, which is injected into, constitutes the battery pack In each battery unit.
12. according to the method for claim 11, wherein calculating 1C capacity retention ratio (%) by following equation 1
(equation 1)
13. according to the method for claim 11, wherein solvent supply amount is calculated as having been injected into the battery pack About the 100% to about 150% of the amount of electrolyte.
14. according to the method for claim 11, in which:
Electrolyte supply is calculated by using following equation 2, to measure the gas for the outside for being discharged to the battery pack Amount, and
Based on the amount of the gas measured, calculating, which is had been injected into and is converted to due to the chemical reaction with electrode assembly, reacts secondary The amount (A) of the electrolyte of product
(equation 2)
Amount of electrolyte (the ml)-A (ml) for electrolyte supply (ml)=have been injected into.
CN201880004552.6A 2017-06-07 2018-01-23 Electrolyte re-injection system for battery pack and method thereof Active CN109997249B (en)

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